Re: [Qemu-devel] [PATCH 07/12] linux-user: AArch64 requires at least 3.8.0

[Riku Voipio <riku.voipio@iki.fi>]

Hi,

Cool work and thanks for early sharing.

On Wed, Mar 06, 2013 at 03:01:15AM +0100, Alexander Graf wrote:
> Glibc 1.17 checks for the host kernel version on startup. Unfortunately,
> it also checks whether the host kernel version is recent enough for the
> target to run at all.
> 
> Since AArch64 support only got introduced in 3.8.0, that means that glibc
> refuses to run on any older kernel version than that.
> 
> To allow for execution of linux-user guests even on older host kernels,
> let's always fake the kernel version to 3.8.0 on AArch64 guests.

We already allow setting uname version at command line (-r) and with
./configure . A better place to hardcode this would be linux-user/main.c
where qemu_uname_release is set. Or even just setting
CONFIG_UNAME_RELEASE to the aarch64 config-target.mak 

Riku

> Signed-off-by: Alexander Graf <agraf@suse.de>
> ---
>  linux-user/syscall.c |    5 +++++
>  1 files changed, 5 insertions(+), 0 deletions(-)
> 
> diff --git a/linux-user/syscall.c b/linux-user/syscall.c
> index 19630ea..38c0711 100644
> --- a/linux-user/syscall.c
> +++ b/linux-user/syscall.c
> @@ -313,7 +313,12 @@ static int sys_uname(struct new_utsname *buf)
>    memset(buf, 0, sizeof(*buf));
>    COPY_UTSNAME_FIELD(buf->sysname, uts_buf.sysname);
>    COPY_UTSNAME_FIELD(buf->nodename, uts_buf.nodename);
> +#ifdef TARGET_ARM64
> +  /* glibc refuses to run on older kernels */
> +  COPY_UTSNAME_FIELD(buf->release, "3.8.0");
> +#else
>    COPY_UTSNAME_FIELD(buf->release, uts_buf.release);
> +#endif
>    COPY_UTSNAME_FIELD(buf->version, uts_buf.version);
>    COPY_UTSNAME_FIELD(buf->machine, uts_buf.machine);
>  #ifdef _GNU_SOURCE
> -- 
> 1.6.0.2